I have an 03 supercab and my a/c and heater only blows out the defroster. When I push the other buttons on the controller nothing happens. I can't hear anything at all when trying to switch between panel, floor etc, no vacuum noise, no clicking, nothing. Someone told me there is a door inside the unit on some models that gets stuck but I have been able to find no reference to this anywhere. I have tried to find a diagram or something to show me where the vacuum lines are so I can check thise. Anyone dealt with this before? Suggestions would be greatly appreciated

 

sounds like you have a vac leak in the system somewhere..it defaults to defrost when that happens